| 23.1 | This level is about a 0.2 percent chance flood meaning that there is a 0.2 percent chance in any given year of the river reaching this level | | 22.4 | This level is about a 1 percent chance flood meaning that there is a 1 percent chance in any given year of the river reaching this level. | | 21.8 | This level is about a 2 percent chance flood meaning that there is a 2 percent chance in any given year of the river reaching this level | | 20.2 | Floodwaters affect homes in the Blackhawk Park area. This level is about a 10 percent chance flood meaning that there is a 10 percent chance in any given year of the river reaching this level | | 18.2 | Floodwaters surround some seasonal homes along Old River Road in the Blackhawk Park area. This level is about a 20 percent chance flood meaning that there is a 20 percent chance in any given year of the river reaching this level | | 18.0 | Floodwaters surround some seasonal homes along Old River Road in the Blackhawk Park area | | 17.0 | There is general overflow of the river. Water is near homes in the Blackhawk Park area of Portage on the west side of the river along Old River Road | | 16.0 | There is minor lowland flooding |
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1) 20.50 ft on 09/14/1938
2) 20.20 ft on 03/17/1973
3) 19.58 ft on 06/25/1993
4) 18.93 ft on 04/23/1996
5) 18.59 ft on 04/23/2008
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1) 6.50 ft on 08/14/1936
2) 8.69 ft on 09/09/2003
3) 8.92 ft on 09/22/2005
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